Mei Kalimatusyaro, Vivi Afbriani, Zuni Humairoh, Fitrotin Hasanah. Effectiveness of Problem-Based Learning in Improving Elementary Students’ Mathematics Achievement. cjee [Internet]. 2026 Jun. 8 [cited 2026 Jun. 10];4(1):125-3. Available from: https://ojs.unsulbar.ac.id/index.php/cjee/article/view/6621